C# 创建，读取，写入XML文件

Xml文件如下：

<?xml version="1.0" encoding="utf-8"?>
<Advertisements>
 <Ad>
 <ImageUrl>001.jpg</ImageUrl>
 <NavigateUrl>001.aspx</NavigateUrl>
 <Impressions>10</Impressions>
 <Keyword>gucas01</Keyword>
 </Ad>
 <Ad>
 <ImageUrl>002.jpg</ImageUrl>
 <NavigateUrl>002.aspx</NavigateUrl>
 <Impressions>20</Impressions>
 <Keyword>gucas02</Keyword>
 </Ad>
 <Ad>
 <ImageUrl>003.jpg</ImageUrl>
 <NavigateUrl>003.aspx</NavigateUrl>
 <Impressions>30</Impressions>
 <Keyword>gucas03</Keyword>
 </Ad>
 <Ad>
 <ImageUrl>004.jpg</ImageUrl>
 <NavigateUrl>004.aspx</NavigateUrl>
 <Impressions>40</Impressions>
 <Keyword>gucas04</Keyword>
 </Ad>
 <Ad>
 <ImageUrl>005.jpg</ImageUrl>
 <NavigateUrl>005.aspx</NavigateUrl>
 <Impressions>50</Impressions>
 <Keyword>gucas05</Keyword>
 </Ad>
 <Ad>
 <ImageUrl>google.gif</ImageUrl>
 <NavigateUrl>http://www.google.com</NavigateUrl>
 <Impressions>30</Impressions>
 <Keyword>google</Keyword>
 </Ad>
</Advertisements> 

对XML文件的操作

/// <summary>
 /// 创建XML文件
 /// </summary>
 /// <param name="filename"></param>
 public void CreateXmlFile(string filename)
 {
  XmlDocument xmldoc = new XmlDocument();
  XmlNode node;
  node = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);
  xmldoc.AppendChild(node);
  XmlNode root = xmldoc.CreateElement("Users");
  xmldoc.AppendChild(root);
  CreateNode(xmldoc, root, "UserName", "zhengyd");
  CreateNode(xmldoc, root, "Email", "zhengyd@gucas.ac,cn");
  CreateNode(xmldoc, root, "Url", "www.gucas.an,cn");
  CreateNode(xmldoc, root, "Age", "27");
  try
  {
   xmldoc.Save(Server.MapPath(filename));
   Response.Write("创建XML文件myxml.xml成功!");
  }
  catch (Exception ex)
  {
   Response.Write(ex.Message);
  }
 }
 /// <summary>
 /// 写入XML文件
 /// </summary>
 /// <param name="file"></param>
 public void WriteXmlFile(string file)
 {
  XmlDocument xmdoc = new XmlDocument();
  try
  {
   xmdoc.Load(Server.MapPath(file));
   XmlNode root = xmdoc.SelectSingleNode("Advertisements");
   if (root != null)
   {
    XmlNode node = xmdoc.CreateNode(XmlNodeType.Element, "Ad", null);
    CreateNode(xmdoc, node, "ImageUrl", "google.gif");
    CreateNode(xmdoc, node, "NavigateUrl", "http://www.google.com");
    CreateNode(xmdoc, node, "Impressions", "30");
    CreateNode(xmdoc, node, "Keyword", "google");
    root.AppendChild(node);
   }
   xmdoc.Save(Server.MapPath(file));
   Response.Write("写入XML文件XMLFile.xml成功。<br>");
  }
  catch(Exception ex) {
   Response.Write(ex.Message);
  }
 }
 /// <summary>
 /// 创建节点
 /// </summary>
 /// <param name="xmldoc"></param>
 /// <param name="parentnode"></param>
 /// <param name="name"></param>
 /// <param name="value"></param>
 public void CreateNode(XmlDocument xmldoc, XmlNode parentnode, string name, string value)
 {
  XmlNode node = xmldoc.CreateNode(XmlNodeType.Element, name, null);
  node.InnerText = value;
  parentnode.AppendChild(node);
 }
 /// <summary>
 /// 读取XML文件
 /// </summary>
 /// <param name="file"></param>
 private void ReadFile(string file)
 {
  XmlDocument xmldoc = new XmlDocument();
  try
  {
   xmldoc.Load(Server.MapPath(file));
   XmlNode node = xmldoc.SelectSingleNode("Advertisements");
   if (node != null)
   {
    TreeNode root = new TreeNode();
    root.Text = node.Name;
    tvXml.Nodes.Add(root);
    foreach (XmlNode xnode in xmldoc.SelectNodes("Advertisements/Ad"))
    {
     TreeNode tnode = new TreeNode();
     tnode.Text = Server.HtmlEncode("<" + xnode.Name + ">");
     root.ChildNodes.Add(tnode);
      foreach (XmlNode xcnode in xnode.ChildNodes)
      {
       TreeNode tcnode = new TreeNode();
       tcnode.Text = Server.HtmlEncode("<" + xcnode.Name + ">" + xcnode.InnerText + "</" + xcnode.Name + ">");
       tnode.ChildNodes.Add(tcnode);
      }
     TreeNode ttnode = new TreeNode();
     ttnode.Text = Server.HtmlEncode("</" + xnode.Name + "");
     root.ChildNodes.Add(ttnode);
    }
    TreeNode tpnode = new TreeNode();
    tpnode.Text = Server.HtmlEncode("</" + node.Name + ">");
    tvXml.Nodes.Add(tpnode);
   }
  }
  catch (Exception ex)
  {
   Response.Write(ex.Message);
  }
 }

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